Add function to add a route

src/router.rs

@@ -22,5 +22,34 @@ impl Router {
             None => respond_not_found(request), 
         } 
     }
+
+    pub fn add_route(&mut self, route: &str, route_function: fn(Request)) {
+        self.routes.insert(route.to_string(), route_function);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use std::collections::HashMap;
+
+    use tiny_http::Request;
+
+    use super::Router;
+
+    #[test]
+    fn test_add_route() {
+        let mut router = Router::new();
+
+        fn test_route(_request: Request) {
+
+        } 
+
+        router.add_route("/test", test_route as fn(Request));
+        
+        let mut expected = HashMap::new();
+        expected.insert("/test".to_string(), test_route as fn(Request));
+
+        assert_eq!(router.routes, expected);
+    }
 }